<?php
header('content-type:text/html;charset=utf-8');

include 'functions.php';

$preg= '/<p>(.*?)<\/p>/';
$str = "<p>QAQweiqu</p><p>2333333</p>";

$re = preg_replace($preg,'<p><strong>\1</strong></p>',$str);
p($re);
